US1315722A - Planograph co - Google Patents

Description

MAcHsNE Tool. APFLICATON FILED'JUNEZI |918 bl M. www W Wyww uw wm. Nm.

R. T. HAZELTON.

MACHINE Tom.

APPLICATION FILED `IIJNF 2l. I9l8.

1,315,722. Patentedsept. 9, 1919.

'5 SHEETS-SHEET 2` w/Mm THE COLUMBIA PLANDGRAPM co., WASHINGTON. DY c,

R. T. HAZELTON.

MACHINE TOOL.

APPLICATlON FILED JUNE 21. 1918.

1,315,722.` Pamedsept. 9,1919.

6 SHEETS-SHEET 3.

awww/Hoz RMTHWWM Noun MQW R. T. HAZELTON.

MACHINE TOOL.

APPLICATION F|Ln1uNE21,19|a.

1,31 5 ,722. Patented Sept. 9, 1919.

R. T. HAZELTON.

MACHINE TOOL.

APPLICATION HLED JUNE 21,1918.

Patented Sept. 9,1919.

6 SHEETS-SHEET 5.

a wven to?,

If v mi x Mii/155271.

R. T. HAZELTON.

MACHINE TOOL.

APPLICATION min :uns 21. 1919.

1,315,722. V Parentedsept. 9,1919.

6 SHEETS-SHEET 6.

UNITED STATES PATENT OFFICE.

ROBERT T. HAZELTON, OF CINCINNATI, OHIO, ASSIGNOR' TO THE CINCINNATI MILLING MACHINE COMPANY, OF OAKLEY, CINCINNATI, OHIO, A CORPORATION OF OHIO.

MACHINE-TOOL.

Patented sept. 9, 1919.

' Application led .Tune 21, 1918. Serial No. 241,213.

To all whom t may concern.'

Be it known that I, ROBERT T.l HAZELTON, a citizen of the United States, and residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented a new and Improved Machine-Tool, of which the following specification is a full disclosure.

This invention deals with machine tools and it proposes sundry improvementsiinparting thereto a greater degree of facility in the manipulation and control thereof. The improvements constituting this invention are especially applicable to so-called milling machines and are of advantage in enhancing the simplicity of a mechanism which inherently possesses a more or less complex organization by reason of its wide range and universality of action.

One of the objectives of this invention 1s to coordinate with the traveling work or tool support an intermediate mechanism capable of being very easily adjusted to yield any one of a wide range of predetermined speeds. That is to say, it provides anintermediate feed changing mechanism which, in this instance, yields sixteen changes arranged in an arithmetical series extending from a predeterminedV minimum to a predetermined niaXimum equa-ling in magnitude about thirty times the minimum. This result is achieved by the employment of comparatively few elements arranged compactly and operated readily.

Another object is to render available. an arrangement whereby a simple hand lever is enabled, in a direct manner, to eect a change from any one feed of the series to any other feed thereof in such a way as to combine the advantages of a so-called selective speed change mechanism with those of a so-called progressive speed change mechanism.

Other objects and advantages will be in part indicated in the following description, and in. part rendered apparent in Connection with the annexed drawings. j

yTo enable others skilled in the art so fully to apprehend the underlying features hereof that they may embody the same by the numerous modifications contemplated by this invention, drawings depicting a preferred typical construction have been annexed as a part of this disclosure, and in such'drawings, like characters of reference denote corresponding parts throughout all of the views, of which:

Figure 1 is a layout in a plane of the gears and clutches and certain operating elements forming a part of the feed change mechanism and transmission devices constituting this invention. Fig. 2 is a fragment tary view showing the index plate and operating lever somewhat enlarged. Fig. 3 is a front elevation of the knee detached from the column, saddle and knee. Fig. 4 is a vertical section through the casing inclosing the feed change mechanism showing the detent devices for definitely locating the various positions of the cam cylinders. Fig. 5 is anV adjoining vertical section through 4the same casingshowing the yokes for shifting the gear couplets to correspond with different feed change ratios. Fig. 6 is a vertical section through the same casing adjacent its forward end showing the means for differentially actuating the cam cylinders in correspondence with the actions" of the mechanical analyzer. Fig. 7 is'an underneath view of the mechanism shown in Fig. 6. Fig. 8vis a fragmentary plan of the detent device shown by Fig. 4. Fig. 9 is a vertical section through line 9 9 on Fig. 1l showing the transmission for propelling the table and the means for substituting the feed byfa quick return movement. Fig. 10 is an end elevation of the table and saddle looking in the direction of the arrow 10 on Fig. l1. Fig. 11 is a plan partially broken away and partially in section of the table showin the transmission elements and the shi ting clutch for causing it to travel tothe right Yor left. Fig. 12 is a fragmentary vertical Vsection through the elevating mechanism of the knee andFig. 13 is a vertical perspective of the lassembled machine. V f' Aj' Referring now to the drawings',`and es? pecially to Fig. 1 thereof, there will be seen a flat layout or development of that portion of this invention constituting thefeed change gears and the transmission elements connecting the same with the feed screws for propelling the table or for lifting the knee. i

. In Vsuch drawings', the casing or casting inclosing` the change gears is indicated by 9 yand in this casing are journaled threepar- Vallel shafts I, J, and K, the former deriving motion from the prime movery through the flexible joint coupling z' and the vlatter transmitting this motion, suitably modified, to the working elements from the gear 71:. The intermediate shaft J has keyed near one end thereof an intermediate gear g (41 teeth) and a pinion g (14 teeth), and it also loosely carries a gear-sleeve 5 providing the several gears e (16 teeth), CZ (27 teeth), Z) (33 teeth), a (36 teeth), and c (22 teeth). One or the other of the gears on the sleeve 5 derives motion from gears shiftable onthe shaft I.

Thus, splined toV said shaft I is a first gear couplet 1 providing gear A (16 teeth) and gear C (22 teeth), and also the second gear couplet 2 providing gear D (25Vteeth) and gear B (19 teeth) these two gear couplets being ar 1anged to slide one way or the other on said shaft to bring into mesh gears A, C, B, or D with the above mentioned gears a, 0, Z1, or d, respectively.

Loosely mounted on the shaft K is a sleeve 7 having a pinion g (19 teeth) and splined on this sleeve 7 is a third gear couplet 3 providing the gears E (32 teeth)'and F (21 teeth). The sleeve 7 also provides the teeth IL forming part of a dogs tooth clutch; the other part being formed of the teeth H provided by the fourth gear couplet 4 splined to the shaft K and providing a gear G (46 teeth).

These couplets 3 and 4 are adapted to be shifted to interinesh gears E, F, G, or H with gears e, d, g, or la. It is noted that gear d may be meslied on the one hand with the gear F or with the gear D or with both simultaneously, and that gears g and gf are permanently in mesh.

As a result of this arrangement, it is possible by meshing any one or more of said gears to obtain any of the following feed ratios:

Ratios. Teeth.

An analysis of this arrangement will show that by shifting gears A, B, C, and D on the one hand or gears 13,1?, G, and H on the other hand, a wide range of feeds becomes selectively or progressively available, dependent upon whether the shifting be done progressively through the series A, B, C, D in cycles or selectively by manipulation of gears E, F, G, and H. In other words, we have four different series of gears A, B, C, and D dominated by the different possible arrangements of gears E, F, Gr, and H; to wit, lirst E-G, second F--G, third E-I-I, fourth F-H. This makes it possible to utilize a single hand lever for the purpose of obtaining any one of the sixteen combinations available in accordance with the foregoing tabulation. Thus, the' movements of the hand lever may lbe resolved into horizontal and vertical ordinates; the one controlling the combinations of the gears E, I?, G, and H and the other determining the utilization of the gears A, B, C, or D.

In accordance with this invention, there is employed a hand lever movable in any direction and in combination with this lever vis arranged what may be termed an analyzer or analyzing mechanism which functions to resolve the movement of the hand lever into its two components corresponding to the ordinate and abscissa or the vertical or horizontal component of the hand lever. The analyzer imparts the vertical movement to one member and the horizontal movement to another member and these two members in turn function to shift the gear sets 1 and 2 on the one hand and 3 and 4 on the other hand. This may moet easily be done by providing these members with cam grooves properly proportioned, contoured, and timed and by arranging suitable yokes in intervening relation between these cam grooves and the gear couplets to be shifted.

rThis arrangement may be put into practical effect in various ways and, as an illustration thereof, reference is made to Figs. 3, 4, and 5 which show the knee O of the milling machine, mounted on one side of `which is an auxiliary casing N, here used to inclose the working elements of one einbodiment of the foregoing mechanism. Figs. 4 and 5 showT the several shafts I, J and Kassembled in compact relation with the cam cylinders X and Y. Two gear segmenta4 and i/ (see Figs. Gand 7) are arranged in mesh with the aforesaid cam Ycylinders and are so mounted that the one inayoscillate about a vertical aXis and thc other about a horizontal axis; e. g., about axes arranged at an angle to one another. This may be done in any convenient niechanical manner as by providing a vertical pivot 40 in the casing N and mounting the gear segment to swing about this pivot so Las to maintain teeth 41 of the segment in mesh with the beveled pinion 42 provided at one end of the cam cylinder X. This cam cylinder may be supported by the two end pivots 43 and so as easily. to turn.

The other gear segment y is approximately L-shaped in contour and is pivoted at the pointsV 44 and45; said points :being co-axial with an axis arranged transversely to the axis of the pivot 40. This gear segment is thereby positioned to keep its teeth 46 permanently in mesh with the teeth 47 of the gear pinion on the end of the other cam cylinder Y; said cylinder being mounted between pivots '48 and 49 in a manner similar to that of the cam cylinder X.

It will be seen that these gear segments a: and g/ oscillate in transverse planes and they are so connected with a hand lever Z as to resolve the movements thereof into its rectilinear components. This is achieved by pivoting the hand lever Z to the gear segment y so that it may swing within the plane containing the axis of the pivots 44and 45 without turning the segment i but not otherwise. Thus, the segment y is provided with a yoke-like portion 50 providing slot 51 parallel with the axis of the segment y. The hand lever Z has a portion 52 extending through this slot and it is pivotally secured therein by means of a pin 53.

It will be seen that all vertical movements of the hand lever Z result in a corresponding oscillation of the yoke y; Whereas transverse.movements of the lever Z have no effect on the segment y. The lever Z is connected to the segment a' in an analogous nia-nner so as to liavea converse effect on said segment. Thus, the segment ou provides an extension terminating in a spherical head 54 centrally coinciding with the axis of the segment y. The portion 52 of the lever Z provides a slot for receiving the ball 54. It will be seen that, by virtue of this arrangement, when the lever Z is swung about the axis of the segment y, it will have no effect on the ball 54 since it contacts therewith only lat points co-axial with the axis of the segment y; but, by reason of the off-set position of the pivot 53, rany transverse movement will cause the extended p0rtion containing the slot to move substantially in the direction of the axis with the result that the ball 54 will be shifted along the axis and thereby rotated about its pivot 40. The sides of the slot are perpendicular to the axis of the segment y.

VIn consequence of this arrangement, the cam cylinders X and Y will be rotated proportionately to their respective components of the movement of the hand leverv In order that this lever may be retained inV any of its predetermined positions, the spherical'plate 55 is bolted to thecasing N and is provided with tabulated apertures 56. con verging according to the pivotal positions of the lever Z. A lock-pin 57 is mounted in the lever Z to plug these various apertures and a hand grip 58 is provided to facilitate the withdrawal of the pin 577 to permit the position of the lever Z to be changed.

In order that the various angular positions of the cani cylinders X and Y'Imay fers 62 resiliently inte interfitting relation with the concavities. This device will accurately position the cani rollers so that the lcam slots thereby provided will be properly lpositioned to maintain the correct mesh of the appropriate gear couplet.

Suitable clutch' shifting yokes intervene 'between the cam cylinders and the various gear couplets, as shown best by Fig. 5. Thus,

'a couplet shifter P is pivoted to a rod 64 and,

at its upper end, is provided with a fork 65 .entering the annular groove 66 of the gear coupletI G and, at its lower end, it has an arm 67 having a finger 68 which enters the cain {slot in the cam cylinder Y and has the ef- 'fect of swinging or shifting the couplet shifter P in accordance with the conformation of the cam groove. A similar shifter intervenes between the second cam groove fon the cylinder Y and the gear couplet E.

An analogous construction obtains for jfcommunicating the motions from the cam grooves on the cylinder X to the two gear couplets on the shaft I. F or example, a

shifter Q, is pivoted about a pin 69 projecting from the casing N and said shifter has a finger 70 entering the cam slot in the cylin- ,kder X. It also has two fingers 71 entering the annular groove 72 of the gear couplet 2 yso as .to shift the latter in accordance with the positions of the cani cylinder X. These cam grooves are of a simple nature, merely providing straight neutral portions for determining the neutral positions of the gear couplets and their portions off-set to the right or left of the neutral position at appropriate points in the circumference of the cani cylinders for the purpose of effecting the right or left shifting of the various cam Shifters, as will be readily understood.

An important feature of this arrangement resides in the index plate pointers provided by the lever Z whereby the operator is enabled, at a glance, to set the mechanism Ato transmit any predetermined feed ratio, without consulting tables or making estimates. The arrangement is such as to permit ofthe use of large sized figures so as to. avoid anyy error dueto iiiconspicuousness. y Y i This index plate is shown best in Fig. 2 and it consists ofa spherical dished plate Q having a rectilinear outline and providing a large central opening g for receiving the hand lever Z and permitting free movement thereof kin any lateral direction. The vertical side margins of this index plate are each subdivided into appropriate divisional blocks- 7 3 so as to provide on each side two vertical rows each consisting `of a series of four .'blocks. These blocks or tablets are comparatively large and are each provided with an appropriate legend in large numerals indicating the rate at which the... table will Qed in inches p er minute. The ratios are those,y tabulated inthe preceding portion of this specification and correspond with the particular number of teeth used in the gearing. Of course, these ratios may be given any desired absolute values and they maybe selected either in a purely arithmetical series or ,in `any other mathematical series desired. The figures used in the blocks or tablets 73 will, however, read directly in terms ofthe rate of f eed of the table seras to sparethe operator the necessity of making mental calculations and thereby avoiding any error likely to `arise therefrom. Thelever Z is provided with two oppositely extending wings or pointers zand e `and preferably these wings have bifurcated ends adapted ,to span the block sections ofthe index plate, rendering the registration A of the lever .Z more certain. The parts are so proportioned that when the lever ,Z is moved to register with anyone of the blocks .on the left side of the index plate,l its right hand pointer will entirely clear thev blocks on the right handside of the index plateand viceversa, thereby avoiding any possibility of a misunderstanding on the part of the user. This proportioning is made feasible by the use of the cam grooveson the cam cylinders X and Y inasmuchasa cam groove permits conformation to any predetermined .movement within a` wide limit. The index plate and the lever aforesaid are preferably mounted on a front face of the knee seas torbe immediately within observation yand reach of the user standing inthe position best enabling him to observe the working of the machine. This is shown best by Fig. 13.

In the foregoing mechanismthe control elements thereof may be incorporated into any conventional machine tool so as to control movementsof the work or tool supporting member, as, for example, the table, saddle or knee of a universal milling machine such as herein shown.

Referring to Fig. 13, there will be. seen a universal milling machine consisting of a so-called column R extending upwardly from a suitable bed-plate r and having. at its upper vend aso-called overarm r `which supports a rotary spindle 74 which carries conventional milling cutter. YIn this .type of machine, the cutter is` rotated `but not translated, and the object to be machined is bolted tio a so-called table which is bodily moved so as to bodily move the object and present it progressively to the action of the cutting tool. In a universal machine it may be desirable to move the object either vertically or rig-ht and left'or in and out and to permit this to be done the frame of the general mechanism for supporting the object is subdivided into three components termed a knee, which moves vertically on the column; the saddle, which moves in and out on the knee; and a table, which moves right and left on the saddle. The knee` is indicated here by S; the saddle by T; and the table by U.

,In order to impart the necessary movements to either of these three elements, appropriate gearing extends to eac-h and is adaptedv to ybe connected kinetically with some element deriving motion through the feed change mechanism aforesaid.

The table U derives its motion (see F ig. l) from the shaft 16 driven by a lgear 153 meshing with another gear 12 connected through a yieldable friction-clutch 11 with a gear l0 meshing with a pinion 7c keyed to the shaft K propelled lby the gear G splined thereto. i

Referring to Fig. 9, this shaft 16 is shown extending parallel with the direction of movement of the saddle T on the lniee S and transversely to the direction of slide of the table U to the saddle T. The shaft 16 extends through a beveled pinion 7 which is journaled inY a portion of the frame of the saddle T so as t0 permit a shifting of the saddlerelatively. to the knee withoutinterfering with the shaft 1G. The bevel gear 7 5 mesheswith another bevel gear 76 which idles on the stub-shaft 77 but which may be mechanically connected therewith whenever it isv desired to feed the table by shifting the clutch `V into the lower position shown by Fig. 9. This causesthe stub-shaft 77 to rotate and thereby drive the bevel gear 7S and rotate the two beveled gears m and a in opposite directions. These beveled gears m and a are sleeved around the feed screw 7 9 kof the table U and are normally disconnected therefrom but, by shifting the clutch 1V either one or the other may be caused to rotate the-feed screw 79 either to the right or the left, 4as the case may be. This feed screw engages a nut 80 fixed to the saddle T and at itsfends is non-translatably journaled to the table so that, as it rotates, it will cause the table to travel to the right or the left. Since the parts thus described all receive their motion through the feed change Y mechanism `previously disclosed, it will be perceived that the table will feed at the predeterminedrate and that this rate may be `changed very easily and quickly by merely shifting the hand lever Z.

Clutch V, when shifted to its upper position to engage a gear 0 will disconnect the table from the aforesaid feed change mechanism and will substitute a connection with a fast return transmission consisting of the gear o, meshing with a bevel p gearedfto another bevel gear g (see Fig. 11) secured to a shaft s carrying another bevel gear t meshing again with another bevellgear'u secured to a shaft v driven by a universal joint w which receives motion from the prime mover of the machine in any appropriate lnanner.

The knee may be caused to feed up or down, i'f desired, by shifting the clutch M (see Fig. 1) either to the right or to the left. This clutch is splined to the shaft 17 and when shifted one way, ity will engage the gear 18 through the teeth 80 and drive theV shaft 17 in one direction; or, when shifted to the other side, it will connect the gear 31 through the teeth 29 with the same shaft 17 and drive it in the opposite direction. The gears 18 and 31 rotate oppositely because gear 18V meshes directly.y with gear 14 fixed to shaft 16,1whereas gear 31 receives its motion through an idler 32 meshing with gear 15, also fixed to shaft 16. `Shaft 17 carries a bevel 33 whichy meshes with a bevel 34 fixed to the shaft 35. Whenthe cl-utch Ml is thrown out, the shaft 35 may be rotated manually by turning the crank 36. f r y Referring to Fig. 12, it will be seen that the shaft 35 carries a'bevel'gear 81 meshing with a correspondingY bevel gear82 secured to the vertical feed screw 83 non-translatably journaled in the frame of the knee S. This vertical feed screw 88 passes through a tubular screw carried by the standard 85 uprising from the base r, therebyk enabling the feed screw to raise and lower the knee. The saddle infan analogous manner, may be caused to feed in and out by motion derived through the aforesaid feed change inechanism.

Referring to Fig. 1, 28 indicates a nut appropriately secured to the saddle T and adapted to be screwed in and out by the thread on 'the end Aof the shaft 27 which extends parallel to the direction of slide of the saddle T and the knee S. This shaft 27 is non-translatably journaled in the frame of the knee S and it is provided with a handwheel 37 whereby it may be manually actuated and also with gearing whereby it may be mechanically krotated in either direction. Thus, the gear 26 meshes with a gear 25 which is secured to a gear 24 meshing with the gear 22"` on a. shiftablel clutch L. This clutch is freely sleeved toa shaft 23v and at its opposite ends is provided with clutch teeth 20 and 21 whereby it may be connected either with gear 19 or with gear 32. The former* receives motion from the gear 18 which is driven oppositely to the shaft 16 by directly engaging with gear 14, whereas the-gear 32 is driven directly by the gear 15 on the same shaft 16. Thus, gears 19 and 32 are both permanently driven in opposite directions by the shaft 16 and, by shifting the clutch L to engage the one or the other, the saddle T may be caused to feed either in or out as desired.

Without further elaboration, the foregoing will so fully reveal the gist ofthis invention that others can, by applying current knowledge, readily adapt it for-various applications without omitting certain features that, from lthe standpoint of the prior art, fairly constituteessential characteristics of the generic or specific aspects of this invention and, therefore, such adaptations should and arey intended to be comprehended within the meaning and range of equivalency of the following claims. Having thus revealed this invention, I claim as new the following combinations of steps and elements or equivalents thereof, and desire to secure the same by Letters Patent of the United States:

1. A machine tool Vcombining two rotary cam'cylinders; four gear sets shiftable thereI by; intermediate gearing yielding a variety of speed ratios in coperation with said gear couplets; a freely movable hand lever; a motion analyzer intervening between said hand lever and said cam cylinders for moving the latter kproportionately to the corresponding component of the movement of the hand lever; and a work support actuated by the said gears.

2. A machine tool combining a traveling work support; Va feed changey gearing for propelling it at various speeds; two independently movable members for` determining the feedratioof said gearing; an index plate having tabulated vertically and horizontally thereon the feed' ratios obtainable from said gearing; a hand lever movable vertically and horizontally to register with any one of said tabulations; and a mechanical analyzer between said lever yand said members for causing the latter to move proportionately 13o the components of movement of said hand ever.

3. A machine tool combining a traveling support; a power driven sha-ft; two gear couplets splined thereto;an intermediate shaft supporting five gears arranged to rotate as a unit, four of .said gears being engageable by the respective gears on sald two couplets; a third shaft; a gear couplet shiftable thereon to engage the fifth gear on said intermediate shaft and also one of said four gears thereof; a speed change gearing deriving motion from said last mentioned gear couplet; a transmission connecting said ing aplurality of gear couplets; a first Coupletshifter connected with two of said couplets so as to cause only one of the gears thereof at a time to function; al second shifter connected wi-th the remaining gear couplets to causetwo of the gears thereof to function simultaneously; and a hand operated means for actuating said shifters independ-ently.

5. A traveling work support; propelling means therefor; and a feed change mechanism for imparting'motion at a predetermined rate to said means, said mechanism comprising a plurality'of gears; means for selectively arranging-any two of said gears in series; gearing for transmitting motion through said serially arranged gears; lanother plurality of gears; means for selectively utilizing any one of said last mentioned plurality of gears for imparting motion to said last mentioned gearing; and a Vsingle lever mechanically connected to bothv of said means for actuating the same in accordance witlr the position of said lever.

SQA traveling work-support; propelling means'therefor; anda feed change mechanism forimparting motion at a predeter- 1ninedrate'toA said means;` said mechanismY comprising:intermediate gears; four shiftablegears'; means for meshing said gears to arrange two of them in serial relation with said: gearing; Vaplurality of gears; means for meshing any one of said gears in propeiling relation with said gearing; a hand leverfreely movable in different directions; anda motion analyzer intervening between said lever yand said means Vto actuate the latter proportionately to the components of the motion of the hand lever.

7; A ltraveling. work-support; propelling means therefor; and a feed change mechanism "for imparting motion at a'predeterminedrat'eto' said means, said mechanism comprising a first pluralityV of shiftable gears; asecond plurality of shiftable gears; gearingintermediatethe same; and means for simultaneously arranging in serial relation any7 two selected gears of said'first plurality; theintermediate gearingyand any one selected gear of said second plurality.

8. A'traveling work-support; propelling meanstherefor; anda feed change mechanism for imparting-motion at a predetermined "rate" to' said' means; said mechanism comprising a 4 first plurality of gears; a secondplurality of gears; gearing inter- Gopl'eshof'fhitpatent maybe obtained forve kcents earch, by addressing the Commissioner of Itatents;V i

mediate the same; and a gear engaging mechanism comprising an operating lever adapted, when moved in one direction, to successively effect an engagement between the various single gears of said `second plurality with said intermediate gearing, and when moved in a transverse direction7 to simultaneously render effective diderent combinations of the gears of said first plurality.

9. A traveling work-support; propelling means therefor; and a feed change mechanism for imparting motion at a predetermined rate to said means, said mechanism comprising two cam cylinders; a first gear segment swinging in a horizontal plane for rotating 'one of said cylinders; a second gear segmem-I swinging in a transverse plane for rotating the other cylinder; a hand lever freely movable in different direction and connected vto actuate the one gear segment in proportion to its movement in the one direction and the other gear segment in proportion to its movement in another direction; and means for enabling said y mechanism to control said feed change mechanism.

10. A traveling work-support; propelling means therefor; and a feed change mechanism for imparting motion at a predeterminedrate rto said means, said mechanism comprising irst and second members separately pivoted to swing about different axes; a hand lever separately pivoted to each of said members whereby it may swing either one or both, in accordance with its direction of movement; an index plate denoting the various positions of said hand lever; and means for enabling said members to determine the operation of said feed change mechanisms."

11; Atraveling work-support; propelling means therefor; and a feed ch( nge mechanism'for imparting motion at a predetermined' rate `to said means, said mechanism comprising an index plate having a large central opening 'and provided with numerals indicating the rate of feed arranged on opposite sides of said opening; a lever having oppositely extending pointers; and a mechanism intervening between said lever and said feed'change mechanism to control the functions of the latter in accordance with the position of said hand lever. y

In witness whereof I hereunto subscribe my name as attested by the two subscribing witnesses; v

yROBERT T. HAZELTON. Witnesses:

SoiJ EINSTEIN; LESTER F. NENNINGER.

Washington,- D. v(1.

Images